Discussion

Explanation:

Let one man complete the piece of work in m days and let one woman complete the piece of work in n days.

∴ 12m = 110 and 20w = 112

∴ 1m = 1120 and 1w = 1240

Let n be the number of days after 9 days that the work takes to get over.

∴ 98m+4w + n8m+4w+10w = 1

∴ 9115+160 + n115+160+124 = 1

∴ 34 + 15n120 = 1

∴ n = 2

Hence, option (a).

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